Davit for life-boats.



0. NILSEN.

'DAVIT FOR LIFE BOATS.

APPLICATION FILED SEPT. 19, 1914 1,170,315. Patented Fb. 1, 1916.

V2 SHEETS-SHEET I.

wi lmmeoz L 1 I 33 iabbozwz I fi v THE COLUMBIA PLANOGRAPH 50., WASHINGTON. n. c.

.0. NILSEN.

DAVIT FOR LIFE BOATS. APPLICATION r1150 SEPT. 19. 1914.

1, 170,3 15. Patented Feb. 1, 1916.

2 SHEETS-SHEET 2.

THE COLUMBIA PLAr OORAPH co.. WASHINGTON, D. C.

OLOF NILSEN, OF HOBOKEN, NEW JERSEY.

DAVIT FOR LIFE-BOATS.

Specification of Letters Patent. Pate11ted Feb. 1, 1916.

Application filed September 19, 1914. Serial No. 862,471.

To all cvhom it may concern Be it known that I, OLoF NILSEN, a citizen of the United States, of the city of Hoboken, in the county of Hudson and State of New Jersey, have invented certain new and useful Improvements in Davits for Life-Boats; and I do hereby declare the following to be a full, clear, and exact description of the invention, such as will enable others skilled in the art to which it appertains to make and use the same.

The primary object of my invention is to provide improved means for swinging a life boat from the inboard to the outboard position or vice versa. I attain the primary object of my invention by providing a single connecting element or lever fulcrumed to the two davits and shift this element by appropriate means which effects the proper relative movement of the davits to properl swing the boat.

In the accompanying drawing, Figure 1 is a view in side elevation showing the boat deck and passenger deck of a ship in conventional arrangement. Fig. 2 is a top plan view with the boat deck broken away. Figs. 3 and 4 illustrate the positions of the parts in operation.

Referring to the drawing I have shown the life boat 1 mounted upon a pair of cradles 1 which are hinged to the boat deck so that they may be turned down and allow the boat to be suspended solely from the davits and swung clear ofthe deck.

At 2 I have shown a vertically mounted shaft which may extend through the two decks and be provided with an operating knob or handle 3 at. its upper end which latter is above the boat deck. This shaft carries a sprocket 4 around which passes a sprocket chain 5. This sprocket chain also passes over idler sprockets 6, 7 and 8, mounted in bearings in the lower face of the gun deck.

The lever 9 constitutes the only connection between the davits and is directly and positively operated bv the sprocket chain. I have shown the lever secured, to the sprocket chain as at 10, a pin 12 being secured to the lever and to one of the links of the chain.

On each of the davits is keyed a laterally disposed arm 13, each of which is fulcrumed to one extremity of the lever.

The direction of movement of the le r consequent upon the course taken by the chain in moving over the sprockets, swings the davits in the customary way, that is, on first starting both davits are swung in one direction until the bow or stern of the life boat has reached the outboard position, after which the other davit is swung out- Ward. The lever is thus provided with 'sub stantially a conveyor and a guide to insure its taking the desired course. When the davits are in the outboard position a notch 14 in the lever is engaged by a lug 15 shown depending from the boat deck and the davits are looked as against further turning in the outboard direction. lVhen in inboard position the lever engages one of the davits as at 16 and prevents further movement.

The sprocket chain may move through suitable brackets or guides 17 and it is desirable to provide a pair of brackets 18 for the lever in the event that its weight might cause it to sag. p

The mechanismvfor lowering and raising the boat forms no part of my invention. I have illustrated a winch 19, however, whose barrels receive the falls from the sheaves on the davits in the usual manner... It is only desirable that this winch shall be located adjacent the operating device 3 so that one deckhand may perform all the necessary work of swinging the davits as well as raising and lowering the boat. To do this he does not have to change his position, and it will be noted that the swinging of the davits is accomplished by the simple continuous turning of the wheel or handle 3 in one direction and that the same is true when swinging the davits to the other position, the only difference being the direction in which the part 3 is turned to accomplish the two purposes.

It will be obvious that my invention is extremely simple and effective. I am enabled to dispense with all changeable gear a conveyerattached to said lever, and means for moving said conveyer to shift said lever and swing said davits to the outboard or inboard positions.

2. In a life boat apparatus, a pair of davits, a lever connecting said davits, a sprocket chain secured to said lever, and means for operating said sprocket chain to shift said lever and swing said davits to the outboard or inboard positions.

3. In a life boat apparatus, a pair of davits, a single lever connecting said davits, means for shifting said lever, and a guide for causing said lever to follow a predetermined path in its shifting movement to swing said davits successively to the outboard or inboard positions.

4. In a life boat apparatus, the combination With a pair of davits, of a shaft having an operating device located adjacent said davits, a sprocket Wheel on said shaft, a series of idler sprockets, a chain passed over all of said sprockets, and a lever connecting said davits .and secured to a link of said chain.

In testimony whereof, I have signed this specification in the presence of tWo subscribing Witnesses.

OLOF NILSEN.

Witnesses:

CHARLES T. BRADLEY, PETER STEHN.

(.iopies' of this patent may be obtained for five cents each, by addressing the Commissioner of Patents.

Washington, D. O. 

